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Title: The frustrated fcc antiferromagnet Ba2 YOsO6: Structural characterization, magnetic properties and neutron scattering studies

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [1];  [4];  [4];  [5];  [6];  [6];  [7];  [8]
  1. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
  2. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronom
  3. McMaster Univ., Hamilton, ON (Canada). Dept. of Chemistry
  4. Univ. of Manitoba, Winnipeg, MB (Canada)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Data Analysis and Visualization Division
  6. Atomic Energy of Canada (AECL), Limited, Chalk River, ON (Canada). Canadian Neutron Beam Centre
  7. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy; Brockhouse Inst. for Materials Research, Hamilton, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada)
  8. McMaster University

Here we report the crystal structure, magnetization, and neutron scattering measurements on the double perovskite Ba2 YOsO6. The Fm$$\bar{3}$$m space group is found both at 290 K and 3.5 K with cell constants a0=8.3541(4) Å and 8.3435(4) Å, respectively. Os5+ (5d3) ions occupy a nondistorted, geometrically frustrated face-centered-cubic (fcc) lattice. A Curie-Weiss temperature θ ~₋700 K suggests the presence of a large antiferromagnetic interaction and a high degree of magnetic frustration. A magnetic transition to long-range antiferromagnetic order, consistent with a type-I fcc state below TN~69 K, is revealed by magnetization, Fisher heat capacity, and elastic neutron scattering, with an ordered moment of 1.65(6) μB on Os5+. The ordered moment is much reduced from either the expected spin-only value of ~3 μB or the value appropriate to 4d3 Ru5+ in isostructural Ba2 YRuO6 of 2.2(1) μB, suggesting a role for spin-orbit coupling (SOC). Triple-axis neutron scattering measurements of the order parameter suggest an additional first-order transition at T=67.45 K, and the existence of a second-ordered state. We find time-of-flight inelastic neutron results reveal a large spin gap Δ~17 meV, unexpected for an orbitally quenched, d3 electronic configuration. In conclusion, we discuss this in the context of the ~5 meV spin gap observed in the related Ru5+,4d3 cubic double perovskite Ba2YRuO6, and attribute the ~3 times larger gap to stronger SOC present in this heavier, 5d, osmate system.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1185738
Alternate ID(s):
OSTI ID: 1180011
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 7; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 65 works
Citation information provided by
Web of Science

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Cited By (10)

Possible Origin of the Absence of Magnetic Order in LiOsO 3 : Spin–Orbit Coupling Controlled Ground State journal September 2018
Spin-orbit coupling control of anisotropy, ground state and frustration in 5d2 Sr2MgOsO6 journal August 2016
Frustration under pressure: Exotic magnetism in new pyrochlore oxides journal April 2015
The complex non-collinear magnetic orderings in Ba 2 YOsO 6 : a new approach to tuning spin-lattice interactions and controlling magnetic orderings in frustrated complex oxides journal August 2019
Spin-orbit coupling induced magnetic anisotropy and large spin wave gap in NaOsO 3 journal November 2018
Magnon spectrum of the Weyl semimetal half-Heusler compound GdPtBi journal January 2020
B a 2 NiOs O 6 : A Dirac-Mott insulator with ferromagnetism near 100 K journal December 2016
Octupolar versus Néel Order in Cubic 5 d 2 Double Perovskites journal February 2020
Spin-orbit coupled systems in the "atomic" limit: rhenates, osmates, iridates text January 2018
Octupolar order in d-orbital Mott insulators text January 2019